https://wiki.debian.org/AptConfiguration#Using_pinning

The company I work for has a apt repo that both has some tools I like to install, but also maintains super new versions of certain libraries and kernels with configs that would break my laptop.

So I have the priority set low enough that if a package exists in any other repo it it preferred over my companies version.

Also sorry for the slow reply I forgot to check my messages 😄

You can set packages from a particular repo to a lower priority so that they are only installed when you expressly ask for them